Thanks bully, nightshooter, boaraxa, mooseman and stug for your advice. I'm taking it in like a sponge! Priceless knowledge from guys that have been out there and done it.
Going out tomorrow morning ill spend half the day out there I reckon, plan is to cover a decent area and search for any recent signs of possums. Mark out a few spots where it would be worth trapping and maybe ill finally set some down in the next couple of days. Just need to get some extras to add to the huge barrel of flour I got given - its out of date will that make a difference? Is there anything else I can be looking for apart from runs and scratched trees on my walk?